123131403191 has 2 divisors, whose sum is σ = 123131403192. Its totient is φ = 123131403190.

The previous prime is 123131403167. The next prime is 123131403247. The reversal of 123131403191 is 191304131321.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123131403191 - 2¹⁰ = 123131402167 is a prime.

It is a super-2 number, since 2×123131403191² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123131403151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61565701595 + 61565701596.

It is an arithmetic number, because the mean of its divisors is an integer number (61565701596).

Almost surely, 2^123131403191 is an apocalyptic number.

123131403191 is a deficient number, since it is larger than the sum of its proper divisors (1).

123131403191 is an equidigital number, since it uses as much as digits as its factorization.

123131403191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The spelling of 123131403191 in words is "one hundred twenty-three billion, one hundred thirty-one million, four hundred three thousand, one hundred ninety-one".